Trolley.



F. KIETLINSKI.

TROLLEY.

APPLICATION FILED APR.1\9.*1911.

1,257,245. Patented Feb.19,1918.'

2 sHETs-SHEET 1.

F. KIETLINSKI'.

TROLLEY.

APPLICATION, FILED APR; 1,9. |917'.

Eatented Feb. 19, 1918.

2 SHEETS-SHEET 2.

T OFC.

FELIX KIETLINSKI, OF MILWAUKEE, WISCONSIN.

TROLLEY.

Specification of Letters Patent.

Patented Feb. 19, 1918.

Application filed April 19, 1917. Serial No. 163,250.

One important object of the invention is to provide an improved form of trolley pole and harp wherein the harp may have an improved swivel connection to the pole.

A second important object of the invention is to provide an improved device of this charatcer which will swivel automatically as a car goes around a curve so that the line of pressure which is the resultant of a vertical component due to the action of the usual spring on the trolley pole and a horizontal component due to centrifugal action, will pass through the wire and thus the tendency of the trolley wheel to jump olf of the wire will be practically eliminated.

lVith the above and other objects in view, such as will be hereinafter apparent the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawing, and specifically claimed.

n the accompanying drawing, like characters of reference indicate like parts in the several views, and

Figure 1 is a side elevation of the upper end of a trolley pole and harp showing the improved construction.

Fig. 2 is a plan view thereof.

Fig. 3 is a section on the line 3-3 of Fig. 1.

Fig. 4 is a median section on the line 1 -4 of Fig. 1.

Fig. 5 is a detail section on the line 5--5 of Fig. 4.

Fig. 6 is a perspective view of a pivot pin used herewith.

Fig. 7 is a vertical section on the line 7 7 of Fig. 4.

Fig. 8 is a plan view of a portion of a car showing the position assumed by the wheel in passing around a curve, the View being somewhat conventionalized to avoid confusion in the details.

Fig. 9 is a detail view of a spring clamp used herewith.

Fig, 10 is a detail view of a modified arrangement of spring centering device, the view being taken on the saine line as Fig. 7.

In the embodiment of the invention herein illustrated there is shown a trolley pole 10 having a head 11 screwed on the upper end thereof. Screwed into the top of this head 11 is the lower threaded portion 12 of a pivot pin having a central polygonal portion 13 and an upper cylindrical portion 14. Seated on the top of the head 11 is a washer 15 having a polygonal opening to receive the polygonal portion 13 of the pivot-pin and in the upper face of this washer is a ball race 16 concentric to the pivot pin. Revoluble on the cylindrical portion 14 of the pivot pin is an upper washer 17 likewise having a ball race 18 which confronts, the ball race 16. Held between these ball races are the bearing balls 19 by means of which the upper plate 17 may freely and veasily revolve on the pivot pin. F iXed to the upper washer 17 is a U- shaped harp 20 wherein is revolubly supported a trolley wheel Q1, the upper plate and harp being held on the pin let by a key 22. Projecting upward from the plate 15 is a pin 28 which passes through an arcuate slot 24: formed in the upper washer 17 and on each side of the pin is a coil spring 25, these springs normally holding the pin centrally of the arcuate slot. Thus while the balls permit a free and steady movement of the harp on the axis of the pole yet the springs always act to restore the wheel to its normal position, while the ends of the slot 2-1 prevent too great movement of the trolley wheel on the axis of the pole.

Now, under ordinary circumstances, as when traveling under a straight track, the trolley wheel will be maintained in its usual position. lVhen the car, however, goes around a curve the harp will assume the position shown in Fig. 8 so that the wire 26 will lie off to the outer side of the curve, the trolley pole rising slightly and the coil springs permitting an angular disposition.

of the wheel with reference to a vertical plane through the axis of the pole. The tendency of the free end of the pole is, of course, to swing toward the outer side of the curve and also to rise. The rising movement is resisted b v the limiting action of the pin and slot while the tendency to swing outward is resisted by the pressure of the wire on the wheel so that the wire is always kept in the bottom of the groove of the trolley wheel and thus the wheel is prevented from jumping` @if the wire.

ln addition to the springs 25 preferably employ a hook-shaped spring clamp 26 which is liXed to the lower washer 15 and is provided with a head 27 riding on the upper surface I" the upper washer so as to hold the upper washer frictionally against movement,

In place of the springs Q and pin 23 may also employ a coil spring 28 one end of which is to the polygonal portion 13 of the center pin while the other end is connected to the upper washer 17, the spring lying in ay recess 29 in the upper washer. may also employ both this spring 28 and the springs if I see fit.

It is obvious that many minor changes may be made in the form and construction of the invention Without departing from the material principles thereof. 1t is not therefore desired to confine the invention to the exact form herein shown and described but it is wished to include all such as properly come within the scope claimed.

Having thus described the invention, what is claimed as new, is z*- 1. The combination with a trolley pole; of a head screwed on the upper end of said pole, a pivot pin havinof a polygonal central portion and havingone end threaded and screwed into the top of said head, the remaining' end being smoothly cylindrical, a washer fitted on the polygonal portion of the pin and resting on top of the head, said washer having a ball race concentric to the pin in its upper face, a second washer revolubly mounted on the cylindrical portion of the pin and having,` a ball race on its lower surface confronting the tiret-mentioned ball race, balls resting` in said races, a U-shaped harp fixed to the upper surface of the upper washer, and a trolley wheel carried by said harp.

2. The combination with a trolley pole; of a head screwed on the upper end of Said pole, a pivot pin having a polygonal central portion and having` one end threaded and screwed into the top of said head, the remaining end being smoothly cylindrical, a

washer fitted on the polygonal. portion of the pin and resting on top of the head, said washer having a ball race concentric to the pin in its upper face, a second washer revolubly mounted on the cylindrical portion of the pin and having` a ball race on its lower surface confronting the rst-inentioned ball race, halls resting in said races, a U-shaped harp fixed to the upper surface of the upper washer, and a trolley wheel carried by said harp, resilient means normally holding the upper wasner against movement relative to the lower washer.

In testimony whereof I atlix my signature.

FELX KIETLNSKI. iitnesses S. S. LUKASZEWICZ, MARTIN LONG.

Uoyel o! this yatelt may he obtained for ve cents each, 'by addressing the Commissioner of Patents, 'Washingtozn D. C. 

